source3/libsmb/async_smb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Infrastructure for async SMB client requests
   4    Copyright (C) Volker Lendecke 2008
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "libsmb/libsmb.h"
  22 #include "../lib/async_req/async_sock.h"
  23 #include "../lib/util/tevent_ntstatus.h"
  24 #include "../lib/util/tevent_unix.h"
  25 #include "async_smb.h"
  26 #include "../libcli/smb/smb_seal.h"
  27 #include "libsmb/nmblib.h"
  28 #include "read_smb.h"
  29
  30 static NTSTATUS cli_pull_raw_error(const uint8_t *buf)
  31 {
  32         uint32_t flags2 = SVAL(buf, smb_flg2);
  33         NTSTATUS status = NT_STATUS(IVAL(buf, smb_rcls));
  34
  35         if (NT_STATUS_IS_OK(status)) {
  36                 return NT_STATUS_OK;
  37         }
  38
  39         if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
  40                 return status;
  41         }
  42
  43         return NT_STATUS_DOS(CVAL(buf, smb_rcls), SVAL(buf,smb_err));
  44 }
  45
  46 /**
  47  * Figure out if there is an andx command behind the current one
  48  * @param[in] buf       The smb buffer to look at
  49  * @param[in] ofs       The offset to the wct field that is followed by the cmd
  50  * @retval Is there a command following?
  51  */
  52
  53 static bool have_andx_command(const char *buf, uint16_t ofs)
  54 {
  55         uint8_t wct;
  56         size_t buflen = talloc_get_size(buf);
  57
  58         if ((ofs == buflen-1) || (ofs == buflen)) {
  59                 return false;
  60         }
  61
  62         wct = CVAL(buf, ofs);
  63         if (wct < 2) {
  64                 /*
  65                  * Not enough space for the command and a following pointer
  66                  */
  67                 return false;
  68         }
  69         return (CVAL(buf, ofs+1) != 0xff);
  70 }
  71
  72 #define MAX_SMB_IOV 5
  73
  74 struct cli_smb_state {
  75         struct tevent_context *ev;
  76         struct cli_state *cli;
  77         uint8_t header[smb_wct+1]; /* Space for the header including the wct */
  78
  79         /*
  80          * For normal requests, cli_smb_req_send chooses a mid. Secondary
  81          * trans requests need to use the mid of the primary request, so we
  82          * need a place to store it. Assume it's set if != 0.
  83          */
  84         uint16_t mid;
  85
  86         uint16_t *vwv;
  87         uint8_t bytecount_buf[2];
  88
  89         struct iovec iov[MAX_SMB_IOV+3];
  90         int iov_count;
  91
  92         uint8_t *inbuf;
  93         uint32_t seqnum;
  94         int chain_num;
  95         int chain_length;
  96         struct tevent_req **chained_requests;
  97
  98         bool one_way;
  99 };
 100
 101 static uint16_t cli_alloc_mid(struct cli_state *cli)
 102 {
 103         int num_pending = talloc_array_length(cli->conn.pending);
 104         uint16_t result;
 105
 106         while (true) {
 107                 int i;
 108
 109                 result = cli->conn.smb1.mid++;
 110                 if ((result == 0) || (result == 0xffff)) {
 111                         continue;
 112                 }
 113
 114                 for (i=0; i<num_pending; i++) {
 115                         if (result == cli_smb_req_mid(cli->conn.pending[i])) {
 116                                 break;
 117                         }
 118                 }
 119
 120                 if (i == num_pending) {
 121                         return result;
 122                 }
 123         }
 124 }
 125
 126 void cli_smb_req_unset_pending(struct tevent_req *req)
 127 {
 128         struct cli_smb_state *state = tevent_req_data(
 129                 req, struct cli_smb_state);
 130         struct cli_state *cli = state->cli;
 131         int num_pending = talloc_array_length(cli->conn.pending);
 132         int i;
 133
 134         if (state->mid != 0) {
 135                 /*
 136                  * This is a [nt]trans[2] request which waits
 137                  * for more than one reply.
 138                  */
 139                 return;
 140         }
 141
 142         talloc_set_destructor(req, NULL);
 143
 144         if (num_pending == 1) {
 145                 /*
 146                  * The pending read_smb tevent_req is a child of
 147                  * cli->pending. So if nothing is pending anymore, we need to
 148                  * delete the socket read fde.
 149                  */
 150                 TALLOC_FREE(cli->conn.pending);
 151                 cli->conn.read_smb_req = NULL;
 152                 return;
 153         }
 154
 155         for (i=0; i<num_pending; i++) {
 156                 if (req == cli->conn.pending[i]) {
 157                         break;
 158                 }
 159         }
 160         if (i == num_pending) {
 161                 /*
 162                  * Something's seriously broken. Just returning here is the
 163                  * right thing nevertheless, the point of this routine is to
 164                  * remove ourselves from cli->conn.pending.
 165                  */
 166                 return;
 167         }
 168
 169         /*
 170          * Remove ourselves from the cli->conn.pending array
 171          */
 172         for (; i < (num_pending - 1); i++) {
 173                 cli->conn.pending[i] = cli->conn.pending[i+1];
 174         }
 175
 176         /*
 177          * No NULL check here, we're shrinking by sizeof(void *), and
 178          * talloc_realloc just adjusts the size for this.
 179          */
 180         cli->conn.pending = talloc_realloc(NULL, cli->conn.pending,
 181                                            struct tevent_req *,
 182                                            num_pending - 1);
 183         return;
 184 }
 185
 186 static int cli_smb_req_destructor(struct tevent_req *req)
 187 {
 188         struct cli_smb_state *state = tevent_req_data(
 189                 req, struct cli_smb_state);
 190         /*
 191          * Make sure we really remove it from
 192          * the pending array on destruction.
 193          */
 194         state->mid = 0;
 195         cli_smb_req_unset_pending(req);
 196         return 0;
 197 }
 198
 199 static bool cli_state_receive_next(struct cli_state *cli);
 200 static void cli_state_notify_pending(struct cli_state *cli, NTSTATUS status);
 201
 202 bool cli_smb_req_set_pending(struct tevent_req *req)
 203 {
 204         struct cli_smb_state *state = tevent_req_data(
 205                 req, struct cli_smb_state);
 206         struct cli_state *cli;
 207         struct tevent_req **pending;
 208         int num_pending;
 209
 210         cli = state->cli;
 211         num_pending = talloc_array_length(cli->conn.pending);
 212
 213         pending = talloc_realloc(cli, cli->conn.pending, struct tevent_req *,
 214                                  num_pending+1);
 215         if (pending == NULL) {
 216                 return false;
 217         }
 218         pending[num_pending] = req;
 219         cli->conn.pending = pending;
 220         talloc_set_destructor(req, cli_smb_req_destructor);
 221
 222         if (!cli_state_receive_next(cli)) {
 223                 /*
 224                  * the caller should notify the current request
 225                  *
 226                  * And all other pending requests get notified
 227                  * by cli_state_notify_pending().
 228                  */
 229                 cli_smb_req_unset_pending(req);
 230                 cli_state_notify_pending(cli, NT_STATUS_NO_MEMORY);
 231                 return false;
 232         }
 233
 234         return true;
 235 }
 236
 237 static void cli_smb_received(struct tevent_req *subreq);
 238 static NTSTATUS cli_state_dispatch_smb1(struct cli_state *cli,
 239                                         TALLOC_CTX *frame,
 240                                         uint8_t *inbuf);
 241
 242 static bool cli_state_receive_next(struct cli_state *cli)
 243 {
 244         size_t num_pending = talloc_array_length(cli->conn.pending);
 245         struct tevent_req *req;
 246         struct cli_smb_state *state;
 247
 248         if (cli->conn.read_smb_req != NULL) {
 249                 return true;
 250         }
 251
 252         if (num_pending == 0) {
 253                 return true;
 254         }
 255
 256         req = cli->conn.pending[0];
 257         state = tevent_req_data(req, struct cli_smb_state);
 258
 259         cli->conn.dispatch_incoming = cli_state_dispatch_smb1;
 260
 261         /*
 262          * We're the first ones, add the read_smb request that waits for the
 263          * answer from the server
 264          */
 265         cli->conn.read_smb_req = read_smb_send(cli->conn.pending, state->ev,
 266                                                cli->conn.fd);
 267         if (cli->conn.read_smb_req == NULL) {
 268                 return false;
 269         }
 270         tevent_req_set_callback(cli->conn.read_smb_req, cli_smb_received, cli);
 271         return true;
 272 }
 273
 274 static void cli_state_notify_pending(struct cli_state *cli, NTSTATUS status)
 275 {
 276         cli_state_disconnect(cli);
 277
 278         /*
 279          * Cancel all pending requests. We do not do a for-loop walking
 280          * cli->conn.pending because that array changes in
 281          * cli_smb_req_destructor().
 282          */
 283         while (talloc_array_length(cli->conn.pending) > 0) {
 284                 struct tevent_req *req;
 285                 struct cli_smb_state *state;
 286
 287                 req = cli->conn.pending[0];
 288                 state = tevent_req_data(req, struct cli_smb_state);
 289
 290                 /*
 291                  * We're dead. No point waiting for trans2
 292                  * replies.
 293                  */
 294                 state->mid = 0;
 295
 296                 cli_smb_req_unset_pending(req);
 297
 298                 /*
 299                  * we need to defer the callback, because we may notify more
 300                  * then one caller.
 301                  */
 302                 tevent_req_defer_callback(req, state->ev);
 303                 tevent_req_nterror(req, status);
 304         }
 305 }
 306
 307 /*
 308  * Fetch a smb request's mid. Only valid after the request has been sent by
 309  * cli_smb_req_send().
 310  */
 311 uint16_t cli_smb_req_mid(struct tevent_req *req)
 312 {
 313         struct cli_smb_state *state = tevent_req_data(
 314                 req, struct cli_smb_state);
 315
 316         if (state->mid != 0) {
 317                 return state->mid;
 318         }
 319
 320         return SVAL(state->header, smb_mid);
 321 }
 322
 323 void cli_smb_req_set_mid(struct tevent_req *req, uint16_t mid)
 324 {
 325         struct cli_smb_state *state = tevent_req_data(
 326                 req, struct cli_smb_state);
 327         state->mid = mid;
 328 }
 329
 330 uint32_t cli_smb_req_seqnum(struct tevent_req *req)
 331 {
 332         struct cli_smb_state *state = tevent_req_data(
 333                 req, struct cli_smb_state);
 334         return state->seqnum;
 335 }
 336
 337 void cli_smb_req_set_seqnum(struct tevent_req *req, uint32_t seqnum)
 338 {
 339         struct cli_smb_state *state = tevent_req_data(
 340                 req, struct cli_smb_state);
 341         state->seqnum = seqnum;
 342 }
 343
 344 static size_t iov_len(const struct iovec *iov, int count)
 345 {
 346         size_t result = 0;
 347         int i;
 348         for (i=0; i<count; i++) {
 349                 result += iov[i].iov_len;
 350         }
 351         return result;
 352 }
 353
 354 static uint8_t *iov_concat(TALLOC_CTX *mem_ctx, const struct iovec *iov,
 355                            int count)
 356 {
 357         size_t len = iov_len(iov, count);
 358         size_t copied;
 359         uint8_t *buf;
 360         int i;
 361
 362         buf = talloc_array(mem_ctx, uint8_t, len);
 363         if (buf == NULL) {
 364                 return NULL;
 365         }
 366         copied = 0;
 367         for (i=0; i<count; i++) {
 368                 memcpy(buf+copied, iov[i].iov_base, iov[i].iov_len);
 369                 copied += iov[i].iov_len;
 370         }
 371         return buf;
 372 }
 373
 374 struct tevent_req *cli_smb_req_create(TALLOC_CTX *mem_ctx,
 375                                       struct event_context *ev,
 376                                       struct cli_state *cli,
 377                                       uint8_t smb_command,
 378                                       uint8_t additional_flags,
 379                                       uint8_t wct, uint16_t *vwv,
 380                                       int iov_count,
 381                                       struct iovec *bytes_iov)
 382 {
 383         struct tevent_req *result;
 384         struct cli_smb_state *state;
 385         struct timeval endtime;
 386
 387         if (iov_count > MAX_SMB_IOV) {
 388                 /*
 389                  * Should not happen :-)
 390                  */
 391                 return NULL;
 392         }
 393
 394         result = tevent_req_create(mem_ctx, &state, struct cli_smb_state);
 395         if (result == NULL) {
 396                 return NULL;
 397         }
 398         state->ev = ev;
 399         state->cli = cli;
 400         state->mid = 0;         /* Set to auto-choose in cli_smb_req_send */
 401         state->chain_num = 0;
 402         state->chained_requests = NULL;
 403
 404         cli_setup_packet_buf(cli, (char *)state->header);
 405         SCVAL(state->header, smb_com, smb_command);
 406         SSVAL(state->header, smb_tid, cli->smb1.tid);
 407         SCVAL(state->header, smb_wct, wct);
 408
 409         state->vwv = vwv;
 410
 411         SSVAL(state->bytecount_buf, 0, iov_len(bytes_iov, iov_count));
 412
 413         state->iov[0].iov_base = (void *)state->header;
 414         state->iov[0].iov_len  = sizeof(state->header);
 415         state->iov[1].iov_base = (void *)state->vwv;
 416         state->iov[1].iov_len  = wct * sizeof(uint16_t);
 417         state->iov[2].iov_base = (void *)state->bytecount_buf;
 418         state->iov[2].iov_len  = sizeof(uint16_t);
 419
 420         if (iov_count != 0) {
 421                 memcpy(&state->iov[3], bytes_iov,
 422                        iov_count * sizeof(*bytes_iov));
 423         }
 424         state->iov_count = iov_count + 3;
 425
 426         if (cli->timeout) {
 427                 endtime = timeval_current_ofs_msec(cli->timeout);
 428                 if (!tevent_req_set_endtime(result, ev, endtime)) {
 429                         return result;
 430                 }
 431         }
 432
 433         switch (smb_command) {
 434         case SMBtranss:
 435         case SMBtranss2:
 436         case SMBnttranss:
 437         case SMBntcancel:
 438                 state->one_way = true;
 439                 break;
 440         case SMBlockingX:
 441                 if ((wct == 8) &&
 442                     (CVAL(vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) {
 443                         state->one_way = true;
 444                 }
 445                 break;
 446         }
 447
 448         return result;
 449 }
 450
 451 static NTSTATUS cli_signv(struct cli_state *cli, struct iovec *iov, int count,
 452                           uint32_t *seqnum)
 453 {
 454         uint8_t *buf;
 455
 456         /*
 457          * Obvious optimization: Make cli_calculate_sign_mac work with struct
 458          * iovec directly. MD5Update would do that just fine.
 459          */
 460
 461         if ((count <= 0) || (iov[0].iov_len < smb_wct)) {
 462                 return NT_STATUS_INVALID_PARAMETER;
 463         }
 464
 465         buf = iov_concat(talloc_tos(), iov, count);
 466         if (buf == NULL) {
 467                 return NT_STATUS_NO_MEMORY;
 468         }
 469
 470         cli_calculate_sign_mac(cli, (char *)buf, seqnum);
 471         memcpy(iov[0].iov_base, buf, iov[0].iov_len);
 472
 473         TALLOC_FREE(buf);
 474         return NT_STATUS_OK;
 475 }
 476
 477 static void cli_smb_sent(struct tevent_req *subreq);
 478
 479 static NTSTATUS cli_smb_req_iov_send(struct tevent_req *req,
 480                                      struct cli_smb_state *state,
 481                                      struct iovec *iov, int iov_count)
 482 {
 483         struct tevent_req *subreq;
 484         NTSTATUS status;
 485
 486         if (!cli_state_is_connected(state->cli)) {
 487                 return NT_STATUS_CONNECTION_DISCONNECTED;
 488         }
 489
 490         if (iov[0].iov_len < smb_wct) {
 491                 return NT_STATUS_INVALID_PARAMETER;
 492         }
 493
 494         if (state->mid != 0) {
 495                 SSVAL(iov[0].iov_base, smb_mid, state->mid);
 496         } else {
 497                 uint16_t mid = cli_alloc_mid(state->cli);
 498                 SSVAL(iov[0].iov_base, smb_mid, mid);
 499         }
 500
 501         smb_setlen((char *)iov[0].iov_base, iov_len(iov, iov_count) - 4);
 502
 503         status = cli_signv(state->cli, iov, iov_count, &state->seqnum);
 504
 505         if (!NT_STATUS_IS_OK(status)) {
 506                 return status;
 507         }
 508
 509         if (cli_state_encryption_on(state->cli)) {
 510                 char *buf, *enc_buf;
 511
 512                 buf = (char *)iov_concat(talloc_tos(), iov, iov_count);
 513                 if (buf == NULL) {
 514                         return NT_STATUS_NO_MEMORY;
 515                 }
 516                 status = common_encrypt_buffer(state->cli->trans_enc_state,
 517                                                (char *)buf, &enc_buf);
 518                 TALLOC_FREE(buf);
 519                 if (!NT_STATUS_IS_OK(status)) {
 520                         DEBUG(0, ("Error in encrypting client message: %s\n",
 521                                   nt_errstr(status)));
 522                         return status;
 523                 }
 524                 buf = (char *)talloc_memdup(state, enc_buf,
 525                                             smb_len(enc_buf)+4);
 526                 SAFE_FREE(enc_buf);
 527                 if (buf == NULL) {
 528                         return NT_STATUS_NO_MEMORY;
 529                 }
 530                 iov[0].iov_base = (void *)buf;
 531                 iov[0].iov_len = talloc_get_size(buf);
 532                 iov_count = 1;
 533         }
 534         subreq = writev_send(state, state->ev, state->cli->conn.outgoing,
 535                              state->cli->conn.fd, false, iov, iov_count);
 536         if (subreq == NULL) {
 537                 return NT_STATUS_NO_MEMORY;
 538         }
 539         tevent_req_set_callback(subreq, cli_smb_sent, req);
 540         return NT_STATUS_OK;
 541 }
 542
 543 NTSTATUS cli_smb_req_send(struct tevent_req *req)
 544 {
 545         struct cli_smb_state *state = tevent_req_data(
 546                 req, struct cli_smb_state);
 547
 548         if (!tevent_req_is_in_progress(req)) {
 549                 return NT_STATUS_INTERNAL_ERROR;
 550         }
 551
 552         return cli_smb_req_iov_send(req, state, state->iov, state->iov_count);
 553 }
 554
 555 struct tevent_req *cli_smb_send(TALLOC_CTX *mem_ctx,
 556                                 struct event_context *ev,
 557                                 struct cli_state *cli,
 558                                 uint8_t smb_command,
 559                                 uint8_t additional_flags,
 560                                 uint8_t wct, uint16_t *vwv,
 561                                 uint32_t num_bytes,
 562                                 const uint8_t *bytes)
 563 {
 564         struct tevent_req *req;
 565         struct iovec iov;
 566         NTSTATUS status;
 567
 568         iov.iov_base = discard_const_p(void, bytes);
 569         iov.iov_len = num_bytes;
 570
 571         req = cli_smb_req_create(mem_ctx, ev, cli, smb_command,
 572                                  additional_flags, wct, vwv, 1, &iov);
 573         if (req == NULL) {
 574                 return NULL;
 575         }
 576         if (!tevent_req_is_in_progress(req)) {
 577                 return tevent_req_post(req, ev);
 578         }
 579         status = cli_smb_req_send(req);
 580         if (!NT_STATUS_IS_OK(status)) {
 581                 tevent_req_nterror(req, status);
 582                 return tevent_req_post(req, ev);
 583         }
 584         return req;
 585 }
 586
 587 static void cli_smb_sent(struct tevent_req *subreq)
 588 {
 589         struct tevent_req *req = tevent_req_callback_data(
 590                 subreq, struct tevent_req);
 591         struct cli_smb_state *state = tevent_req_data(
 592                 req, struct cli_smb_state);
 593         ssize_t nwritten;
 594         int err;
 595
 596         nwritten = writev_recv(subreq, &err);
 597         TALLOC_FREE(subreq);
 598         if (nwritten == -1) {
 599                 NTSTATUS status = map_nt_error_from_unix(err);
 600                 cli_state_notify_pending(state->cli, status);
 601                 return;
 602         }
 603
 604         if (state->one_way) {
 605                 state->inbuf = NULL;
 606                 tevent_req_done(req);
 607                 return;
 608         }
 609
 610         if (!cli_smb_req_set_pending(req)) {
 611                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 612                 return;
 613         }
 614 }
 615
 616 static void cli_smb_received(struct tevent_req *subreq)
 617 {
 618         struct cli_state *cli = tevent_req_callback_data(
 619                 subreq, struct cli_state);
 620         TALLOC_CTX *frame = talloc_stackframe();
 621         NTSTATUS status;
 622         uint8_t *inbuf;
 623         ssize_t received;
 624         int err;
 625
 626         if (subreq != cli->conn.read_smb_req) {
 627                 DEBUG(1, ("Internal error: cli_smb_received called with "
 628                           "unexpected subreq\n"));
 629                 status = NT_STATUS_INTERNAL_ERROR;
 630                 cli_state_notify_pending(cli, status);
 631                 TALLOC_FREE(frame);
 632                 return;
 633         }
 634
 635         received = read_smb_recv(subreq, frame, &inbuf, &err);
 636         TALLOC_FREE(subreq);
 637         cli->conn.read_smb_req = NULL;
 638         if (received == -1) {
 639                 status = map_nt_error_from_unix(err);
 640                 cli_state_notify_pending(cli, status);
 641                 TALLOC_FREE(frame);
 642                 return;
 643         }
 644
 645         status = cli->conn.dispatch_incoming(cli, frame, inbuf);
 646         TALLOC_FREE(frame);
 647         if (NT_STATUS_IS_OK(status)) {
 648                 /*
 649                  * We should not do any more processing
 650                  * as the dispatch function called
 651                  * tevent_req_done().
 652                  */
 653                 return;
 654         } else if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 655                 /*
 656                  * We got an error, so notify all pending requests
 657                  */
 658                 cli_state_notify_pending(cli, status);
 659                 return;
 660         }
 661
 662         /*
 663          * We got NT_STATUS_RETRY, so we may ask for a
 664          * next incoming pdu.
 665          */
 666         if (!cli_state_receive_next(cli)) {
 667                 cli_state_notify_pending(cli, NT_STATUS_NO_MEMORY);
 668         }
 669 }
 670
 671 static NTSTATUS cli_state_dispatch_smb1(struct cli_state *cli,
 672                                         TALLOC_CTX *frame,
 673                                         uint8_t *inbuf)
 674 {
 675         struct tevent_req *req;
 676         struct cli_smb_state *state;
 677         NTSTATUS status;
 678         int num_pending;
 679         int i;
 680         uint16_t mid;
 681         bool oplock_break;
 682
 683         if ((IVAL(inbuf, 4) != 0x424d53ff) /* 0xFF"SMB" */
 684             && (SVAL(inbuf, 4) != 0x45ff)) /* 0xFF"E" */ {
 685                 DEBUG(10, ("Got non-SMB PDU\n"));
 686                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 687         }
 688
 689         if (cli_state_encryption_on(cli) && (CVAL(inbuf, 0) == 0)) {
 690                 uint16_t enc_ctx_num;
 691
 692                 status = get_enc_ctx_num(inbuf, &enc_ctx_num);
 693                 if (!NT_STATUS_IS_OK(status)) {
 694                         DEBUG(10, ("get_enc_ctx_num returned %s\n",
 695                                    nt_errstr(status)));
 696                         return status;
 697                 }
 698
 699                 if (enc_ctx_num != cli->trans_enc_state->enc_ctx_num) {
 700                         DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
 701                                    enc_ctx_num,
 702                                    cli->trans_enc_state->enc_ctx_num));
 703                         return NT_STATUS_INVALID_HANDLE;
 704                 }
 705
 706                 status = common_decrypt_buffer(cli->trans_enc_state,
 707                                                (char *)inbuf);
 708                 if (!NT_STATUS_IS_OK(status)) {
 709                         DEBUG(10, ("common_decrypt_buffer returned %s\n",
 710                                    nt_errstr(status)));
 711                         return status;
 712                 }
 713         }
 714
 715         mid = SVAL(inbuf, smb_mid);
 716         num_pending = talloc_array_length(cli->conn.pending);
 717
 718         for (i=0; i<num_pending; i++) {
 719                 if (mid == cli_smb_req_mid(cli->conn.pending[i])) {
 720                         break;
 721                 }
 722         }
 723         if (i == num_pending) {
 724                 /* Dump unexpected reply */
 725                 return NT_STATUS_RETRY;
 726         }
 727
 728         oplock_break = false;
 729
 730         if (mid == 0xffff) {
 731                 /*
 732                  * Paranoia checks that this is really an oplock break request.
 733                  */
 734                 oplock_break = (smb_len(inbuf) == 51); /* hdr + 8 words */
 735                 oplock_break &= ((CVAL(inbuf, smb_flg) & FLAG_REPLY) == 0);
 736                 oplock_break &= (CVAL(inbuf, smb_com) == SMBlockingX);
 737                 oplock_break &= (SVAL(inbuf, smb_vwv6) == 0);
 738                 oplock_break &= (SVAL(inbuf, smb_vwv7) == 0);
 739
 740                 if (!oplock_break) {
 741                         /* Dump unexpected reply */
 742                         return NT_STATUS_RETRY;
 743                 }
 744         }
 745
 746         req = cli->conn.pending[i];
 747         state = tevent_req_data(req, struct cli_smb_state);
 748
 749         if (!oplock_break /* oplock breaks are not signed */
 750             && !cli_check_sign_mac(cli, (char *)inbuf, state->seqnum+1)) {
 751                 DEBUG(10, ("cli_check_sign_mac failed\n"));
 752                 return NT_STATUS_ACCESS_DENIED;
 753         }
 754
 755         if (state->chained_requests != NULL) {
 756                 struct tevent_req **chain = talloc_move(frame,
 757                                             &state->chained_requests);
 758                 int num_chained = talloc_array_length(chain);
 759
 760                 /*
 761                  * We steal the inbuf to the chain,
 762                  * so that it will stay until all
 763                  * requests of the chain are finished.
 764                  *
 765                  * Each requests in the chain will
 766                  * hold a talloc reference to the chain.
 767                  * This way we do not expose the talloc_reference()
 768                  * behavior to the callers.
 769                  */
 770                 talloc_steal(chain, inbuf);
 771
 772                 for (i=0; i<num_chained; i++) {
 773                         struct tevent_req **ref;
 774
 775                         req = chain[i];
 776                         state = tevent_req_data(req, struct cli_smb_state);
 777
 778                         cli_smb_req_unset_pending(req);
 779
 780                         /*
 781                          * as we finish multiple requests here
 782                          * we need to defer the callbacks as
 783                          * they could destroy our current stack state.
 784                          */
 785                         tevent_req_defer_callback(req, state->ev);
 786
 787                         ref = talloc_reference(state, chain);
 788                         if (tevent_req_nomem(ref, req)) {
 789                                 continue;
 790                         }
 791
 792                         state->inbuf = inbuf;
 793                         state->chain_num = i;
 794                         state->chain_length = num_chained;
 795
 796                         tevent_req_done(req);
 797                 }
 798
 799                 return NT_STATUS_RETRY;
 800         }
 801
 802         cli_smb_req_unset_pending(req);
 803
 804         state->inbuf = talloc_move(state, &inbuf);
 805         state->chain_num = 0;
 806         state->chain_length = 1;
 807
 808         if (talloc_array_length(cli->conn.pending) == 0) {
 809                 tevent_req_done(req);
 810                 return NT_STATUS_OK;
 811         }
 812
 813         tevent_req_defer_callback(req, state->ev);
 814         tevent_req_done(req);
 815         return NT_STATUS_RETRY;
 816 }
 817
 818 NTSTATUS cli_smb_recv(struct tevent_req *req,
 819                       TALLOC_CTX *mem_ctx, uint8_t **pinbuf,
 820                       uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 821                       uint32_t *pnum_bytes, uint8_t **pbytes)
 822 {
 823         struct cli_smb_state *state = tevent_req_data(
 824                 req, struct cli_smb_state);
 825         NTSTATUS status = NT_STATUS_OK;
 826         uint8_t cmd, wct;
 827         uint16_t num_bytes;
 828         size_t wct_ofs, bytes_offset;
 829         int i;
 830
 831         if (tevent_req_is_nterror(req, &status)) {
 832                 return status;
 833         }
 834
 835         if (state->inbuf == NULL) {
 836                 if (min_wct != 0) {
 837                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
 838                 }
 839                 if (pinbuf) {
 840                         *pinbuf = NULL;
 841                 }
 842                 if (pwct) {
 843                         *pwct = 0;
 844                 }
 845                 if (pvwv) {
 846                         *pvwv = NULL;
 847                 }
 848                 if (pnum_bytes) {
 849                         *pnum_bytes = 0;
 850                 }
 851                 if (pbytes) {
 852                         *pbytes = NULL;
 853                 }
 854                 /* This was a request without a reply */
 855                 return NT_STATUS_OK;
 856         }
 857
 858         wct_ofs = smb_wct;
 859         cmd = CVAL(state->inbuf, smb_com);
 860
 861         for (i=0; i<state->chain_num; i++) {
 862                 if (i < state->chain_num-1) {
 863                         if (cmd == 0xff) {
 864                                 return NT_STATUS_REQUEST_ABORTED;
 865                         }
 866                         if (!is_andx_req(cmd)) {
 867                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 868                         }
 869                 }
 870
 871                 if (!have_andx_command((char *)state->inbuf, wct_ofs)) {
 872                         /*
 873                          * This request was not completed because a previous
 874                          * request in the chain had received an error.
 875                          */
 876                         return NT_STATUS_REQUEST_ABORTED;
 877                 }
 878
 879                 wct_ofs = SVAL(state->inbuf, wct_ofs + 3);
 880
 881                 /*
 882                  * Skip the all-present length field. No overflow, we've just
 883                  * put a 16-bit value into a size_t.
 884                  */
 885                 wct_ofs += 4;
 886
 887                 if (wct_ofs+2 > talloc_get_size(state->inbuf)) {
 888                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
 889                 }
 890
 891                 cmd = CVAL(state->inbuf, wct_ofs + 1);
 892         }
 893
 894         state->cli->raw_status = cli_pull_raw_error(state->inbuf);
 895         if (NT_STATUS_IS_DOS(state->cli->raw_status)) {
 896                 uint8_t eclass = NT_STATUS_DOS_CLASS(state->cli->raw_status);
 897                 uint16_t ecode = NT_STATUS_DOS_CODE(state->cli->raw_status);
 898                 /*
 899                  * TODO: is it really a good idea to do a mapping here?
 900                  *
 901                  * The old cli_pull_error() also does it, so I do not change
 902                  * the behavior yet.
 903                  */
 904                 status = dos_to_ntstatus(eclass, ecode);
 905         } else {
 906                 status = state->cli->raw_status;
 907         }
 908
 909         if (!have_andx_command((char *)state->inbuf, wct_ofs)) {
 910
 911                 if ((cmd == SMBsesssetupX)
 912                     && NT_STATUS_EQUAL(
 913                             status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 914                         /*
 915                          * NT_STATUS_MORE_PROCESSING_REQUIRED is a
 916                          * valid return code for session setup
 917                          */
 918                         goto no_err;
 919                 }
 920
 921                 if (NT_STATUS_IS_ERR(status)) {
 922                         /*
 923                          * The last command takes the error code. All
 924                          * further commands down the requested chain
 925                          * will get a NT_STATUS_REQUEST_ABORTED.
 926                          */
 927                         return status;
 928                 }
 929         }
 930
 931 no_err:
 932
 933         wct = CVAL(state->inbuf, wct_ofs);
 934         bytes_offset = wct_ofs + 1 + wct * sizeof(uint16_t);
 935         num_bytes = SVAL(state->inbuf, bytes_offset);
 936
 937         if (wct < min_wct) {
 938                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 939         }
 940
 941         /*
 942          * wct_ofs is a 16-bit value plus 4, wct is a 8-bit value, num_bytes
 943          * is a 16-bit value. So bytes_offset being size_t should be far from
 944          * wrapping.
 945          */
 946         if ((bytes_offset + 2 > talloc_get_size(state->inbuf))
 947             || (bytes_offset > 0xffff)) {
 948                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 949         }
 950
 951         if (pwct != NULL) {
 952                 *pwct = wct;
 953         }
 954         if (pvwv != NULL) {
 955                 *pvwv = (uint16_t *)(state->inbuf + wct_ofs + 1);
 956         }
 957         if (pnum_bytes != NULL) {
 958                 *pnum_bytes = num_bytes;
 959         }
 960         if (pbytes != NULL) {
 961                 *pbytes = (uint8_t *)state->inbuf + bytes_offset + 2;
 962         }
 963         if ((mem_ctx != NULL) && (pinbuf != NULL)) {
 964                 if (state->chain_num == state->chain_length-1) {
 965                         *pinbuf = talloc_move(mem_ctx, &state->inbuf);
 966                 } else {
 967                         *pinbuf = state->inbuf;
 968                 }
 969         }
 970
 971         return status;
 972 }
 973
 974 size_t cli_smb_wct_ofs(struct tevent_req **reqs, int num_reqs)
 975 {
 976         size_t wct_ofs;
 977         int i;
 978
 979         wct_ofs = smb_wct - 4;
 980
 981         for (i=0; i<num_reqs; i++) {
 982                 struct cli_smb_state *state;
 983                 state = tevent_req_data(reqs[i], struct cli_smb_state);
 984                 wct_ofs += iov_len(state->iov+1, state->iov_count-1);
 985                 wct_ofs = (wct_ofs + 3) & ~3;
 986         }
 987         return wct_ofs;
 988 }
 989
 990 NTSTATUS cli_smb_chain_send(struct tevent_req **reqs, int num_reqs)
 991 {
 992         struct cli_smb_state *first_state = tevent_req_data(
 993                 reqs[0], struct cli_smb_state);
 994         struct cli_smb_state *last_state = tevent_req_data(
 995                 reqs[num_reqs-1], struct cli_smb_state);
 996         struct cli_smb_state *state;
 997         size_t wct_offset;
 998         size_t chain_padding = 0;
 999         int i, iovlen;
1000         struct iovec *iov = NULL;
1001         struct iovec *this_iov;
1002         NTSTATUS status;
1003
1004         iovlen = 0;
1005         for (i=0; i<num_reqs; i++) {
1006                 if (!tevent_req_is_in_progress(reqs[i])) {
1007                         return NT_STATUS_INTERNAL_ERROR;
1008                 }
1009
1010                 state = tevent_req_data(reqs[i], struct cli_smb_state);
1011                 iovlen += state->iov_count;
1012         }
1013
1014         iov = talloc_array(last_state, struct iovec, iovlen);
1015         if (iov == NULL) {
1016                 return NT_STATUS_NO_MEMORY;
1017         }
1018
1019         first_state->chained_requests = (struct tevent_req **)talloc_memdup(
1020                 last_state, reqs, sizeof(*reqs) * num_reqs);
1021         if (first_state->chained_requests == NULL) {
1022                 TALLOC_FREE(iov);
1023                 return NT_STATUS_NO_MEMORY;
1024         }
1025
1026         wct_offset = smb_wct - 4;
1027         this_iov = iov;
1028
1029         for (i=0; i<num_reqs; i++) {
1030                 size_t next_padding = 0;
1031                 uint16_t *vwv;
1032
1033                 state = tevent_req_data(reqs[i], struct cli_smb_state);
1034
1035                 if (i < num_reqs-1) {
1036                         if (!is_andx_req(CVAL(state->header, smb_com))
1037                             || CVAL(state->header, smb_wct) < 2) {
1038                                 TALLOC_FREE(iov);
1039                                 TALLOC_FREE(first_state->chained_requests);
1040                                 return NT_STATUS_INVALID_PARAMETER;
1041                         }
1042                 }
1043
1044                 wct_offset += iov_len(state->iov+1, state->iov_count-1) + 1;
1045                 if ((wct_offset % 4) != 0) {
1046                         next_padding = 4 - (wct_offset % 4);
1047                 }
1048                 wct_offset += next_padding;
1049                 vwv = state->vwv;
1050
1051                 if (i < num_reqs-1) {
1052                         struct cli_smb_state *next_state = tevent_req_data(
1053                                 reqs[i+1], struct cli_smb_state);
1054                         SCVAL(vwv+0, 0, CVAL(next_state->header, smb_com));
1055                         SCVAL(vwv+0, 1, 0);
1056                         SSVAL(vwv+1, 0, wct_offset);
1057                 } else if (is_andx_req(CVAL(state->header, smb_com))) {
1058                         /* properly end the chain */
1059                         SCVAL(vwv+0, 0, 0xff);
1060                         SCVAL(vwv+0, 1, 0xff);
1061                         SSVAL(vwv+1, 0, 0);
1062                 }
1063
1064                 if (i == 0) {
1065                         this_iov[0] = state->iov[0];
1066                 } else {
1067                         /*
1068                          * This one is a bit subtle. We have to add
1069                          * chain_padding bytes between the requests, and we
1070                          * have to also include the wct field of the
1071                          * subsequent requests. We use the subsequent header
1072                          * for the padding, it contains the wct field in its
1073                          * last byte.
1074                          */
1075                         this_iov[0].iov_len = chain_padding+1;
1076                         this_iov[0].iov_base = (void *)&state->header[
1077                                 sizeof(state->header) - this_iov[0].iov_len];
1078                         memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
1079                 }
1080                 memcpy(this_iov+1, state->iov+1,
1081                        sizeof(struct iovec) * (state->iov_count-1));
1082                 this_iov += state->iov_count;
1083                 chain_padding = next_padding;
1084         }
1085
1086         status = cli_smb_req_iov_send(reqs[0], last_state, iov, iovlen);
1087         if (!NT_STATUS_IS_OK(status)) {
1088                 TALLOC_FREE(iov);
1089                 TALLOC_FREE(first_state->chained_requests);
1090                 return status;
1091         }
1092
1093         return NT_STATUS_OK;
1094 }
1095
1096 bool cli_has_async_calls(struct cli_state *cli)
1097 {
1098         return ((tevent_queue_length(cli->conn.outgoing) != 0)
1099                 || (talloc_array_length(cli->conn.pending) != 0));
1100 }